1. Chill a 1-quart square or long pan in the refrigerator until the gelatin mixture is ready. Then rinse it with cold water but do not dry it.
2. Soak the gelatin in the cold water, then stir it into the boiling water to dissolve. Add the sugar, lemon juice and salt. Chill until it begins to stiffen.
3. Add the vegetables. Turn into the square or oblong mold.
4. Chill until firm, 1 hour or longer.